It's not just hard work to become a doctor. It's hard work and sustained excellence. You don't just put in the hours, you have consume an enormous amount of information and are tested on it constantly through the education process. You have to take on enormous personal risk financially in loans. You very frequently have to make large personal sacrifice in your life to get to the point of board certification.

Some get paid great, most get paid well, but if you know more than a few doctors you would probably be less glib. /me not a doctor.